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Re: Engine knock (code 304)
You probably just have a case of bad pre-ignition. Unless the engine has seen severe overheating, the heads and gaskets are OK.
You didn't mention any coolant loss ....???
So, I'm going suggest that you go ahead and jump into the upper intake manifold repair. Your Winnie is at the mileage where the problem will show up. The job is not that big or expensive .... except for the isolator bolts, and with a bit of shopping you should be able to buy them for $6 x 8 at a Ford dealer. I'm guessing $75, or so, for gaskets and all. You will learn about the IMRC and the EGR jets all in the same job. .... and feel so good when the job is completed and the Winnie is running good again.
If you do have coolant loss, you may want to consider adding the gaskets on the lower intake manifold .... a heck more work.
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